I wondered what the correct procedure is for deactivating an asset when the copyright expires? I will tell content authors to use the expires option in the Advanced part of the Asset properties. However I wonder what will happen to the asset on the publish instance? If the reference page is live, will the asset dissapear after it has deactivated itself?
Do you mean - if a copyright asset has expired then author can set off time or license expiry in the meta data in the DAM and also set an off time for the page in Publish end within the page properties?
Expiry is at author end and will add label of Expired on thumb letting users know this is something which should not be used at author end. For publish end this off time is recommended - Dam Assets Ontime and Offtime Behavior along with expiry